<!-- <html>
<title>My GameEngine</title>

<body>
    <canvas id="gameCavas" width="800" height="800"></canvas>
    <script src="Out/2.js"></script>
</body>

</html> -->
<html>

<body>
    <canvas id="can" width="400" height="400" style="background: Black"></canvas>
    <script>  
        var sn = [42, 41], dz = 43, fx = 1, n, ctx = document.getElementById("can").getContext("2d");
        function draw(t, c) {
            ctx.fillStyle = c;
            ctx.fillRect(t % 20 * 20 + 1, ~~(t / 20) * 20 + 1, 18, 18);
        }
        document.onkeydown = function (e) {
            fx = sn[1] - sn[0] == (n = [-1, -20, 1, 20][(e || event).keyCode - 37] || fx) ? fx : n
        };
        !function () {
            sn.unshift(n = sn[0] + fx);
            if (sn.indexOf(n, 1) > 0 || n < 0 || n > 399 || fx == 1 && n % 20 == 0 || fx == -1 && n % 20 == 19)
                return alert("GAME OVER");
            draw(n, "Lime");
            if (n == dz) {
                while (sn.indexOf(dz = ~~(Math.random() * 400)) >= 0);
                draw(dz, "Yellow");
            } else
                draw(sn.pop(), "Black");
            setTimeout(arguments.callee, 130);
        }();  
    </script>
</body>

</html>